BART riders could see delays of 20 to 40 minutes this weekend and next on some lines due to maintenance work and repairs to electrical cables that will shut down half the Transbay Tube.

Riders traveling from any San Francisco or Peninsula station toward Dublin or Fremont during the affected hours will need to take a Pittsburg/Bay Point-bound train to travel through the tube, BART officials said.

They will then need to get off the train at 12th Street Station in Oakland and go downstairs to transfer to a special Dublin- or Fremont-bound train.

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Those traveling from Fremont or Dublin to San Francisco and Daly City will take their usual trains, but the trains will be diverted at MacArthur Station.

They will also need to get off the train at 12th Street station and transfer to a San Francisco-bound train.

East Bay trains that are not crossing the Bay could also see delays of five to 10 minutes, officials said.

BART delays

The Transbay Tube will be partially closed, delaying BART trains during the following hours:

SaturdayWork starts after the last train on Friday. Work ends at 7:30 a.m.

SundayWork starts after the last train Saturday. Work ends at 2:30 p.m.

MondayWork starts after the last train Sunday. Work ends at 2:30 p.m. (Also note that BART will be running on a Sunday schedule on Monday, May 30, for the Memorial Day holiday).

Saturday, June 4Work starts after the last train Friday. Work ends at 7:30 a.m.

Sunday, June 5Work starts after the last train Saturday. Work ends at 2:30 p.m.

Source: BART

Memorial Day

Area transit agencies to run Sunday schedules for Memorial Day on Monday

Muni: Will operate on its Sunday schedule. Lines will start later and run less frequently.

Caltrain: Will operate on its Sunday schedule. It will operate 28 local trains between San Francisco and San Jose, and four baby bullet trains. Train service will not operate south of San Jose Diridon Station, although there will be a bus shuttle. Last southbound train of the day will leave San Francisco at 9:15 p.m.

BART: Will operate on its Sunday schedule. First trains will start at approximately 8 a.m., two hours later than normal schedule.

SamTrans: Will operate on its Sunday schedule. Lines will start later and run less frequently.

Golden Gate Transit: Will operate on its Sunday schedule. No commute buses or ferries.